High cruise lean- Silber kit

[buckshot]

I was really trying to figure this out today. I realized on my sled that it happens right when the exhaust valves open up. If we can delay the valves from opening up until we are off the green settings or add more fuel sooner just as the valves are opening.

 

[turbo RMK]

mine does it aswell as soon as it starts building boost it gets lean if held at that spot i just added green makes it a little rich on bottom end but helps on the lean spot untill sec injectors open

 

[Sunvang]

Mine do the same too which caused alot of dET problems for me, but try to put your green higher, and red blue lower.

 

[tree climber]

thats a question i had about the EV springs that nobody seemed to know an answer to. thought since we were building way more power and pressure in the cylinders maybe we should be using the stiffest spring they make but then would that hurt bottom end?

 

[buckshot]

Tree- your on the same wave as I. I don't think a heavier spring would affect the bottom end as much as hold back the motor and cause a rougher transition. The best wold be to be able to re-program the ecu to activate the ev solenoid a little higher rpm so we are just into the boost. We should be able to install a little box in between the ecu and the ev solenoid to do this. "we" meaning someone hahaha

 

[dmj1]

by pass

I by passed the exhaust valve controller
left it hooked up to the ecu but tied the the 2 vavles together with new hose. Have not seen any lean spot what so ever. Probably 800 kms boosted this way?

 

[adam5187]

So you just hooked the two together with one hose?

 

[joshkoltes]

lean

my med-high cruise was reading lean as well. i was watching it keeping it under the blue mode and the afr was reading 18 ish yikes! i adjusted the green setting way up and took care of that but now i get a little pop? not a back fire? sounds like a light pop coming from the turbo? is that called turbo fart? only happens when going from a short pull then chopping the throttle. probably just need to lower that yellow blue?

 

[tree climber]

I tried both ways. with the hoses plugged and then back to using the solenoid.. made no difference on mine and if i remember correctly doesnt the solenoid delay the opening of the valves?

 

[buckshot]

Disconnecting the lines is not what I'm looking for. I'm looking to delay them from opening some more.

 

[Eli]

I was really trying to figure this out today. I realized on my sled that it happens right when the exhaust valves open up. If we can delay the valves from opening up until we are off the green settings or add more fuel sooner just as the valves are opening.

Initial valve opening lowers airflow initially. A late opening valve, at least with Dragons, can cause a lean spot because the ecu is anticipating the initial lower airflow with valve opening. Dynotech had a complete writeup on it. They thought mid-range lean spots may be from delayed valve opening.

 

[buckshot]

Interesting... Thanks for the info. Maybe I was looking at it all wrong and we could try get them to open sooner... Lighter spring or disconnect the solinoid